iOS之AES加解密示例

待我称王封你为后i 2022-06-08 11:15 472阅读 0赞

# iOS之AES加解密示例 #

网上很多都是传入字符串的，但有时候我们并不是字符串，而是而直接使用NSData类型，我这里改动了一下。

//
    // LanAES.m
    // AESSample
    //
    // Created by Things on 2017/8/17.
    // Copyright © 2017年 Xanthuim. All rights reserved.
    //
    
    #import "AESUtil.h"
    
    @implementation AESUtil
    
    //解密
    + (NSData *) AES256_Decrypt:(NSData *)data withKey:(NSData *)key{
    
        char keyPtr[kCCKeySizeAES256+1];
        bzero(keyPtr, sizeof(keyPtr));
        //[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
        [key getBytes:keyPtr length:kCCKeySizeAES128+1];
    
        NSUInteger dataLength = [data length];
        size_t bufferSize = dataLength + kCCBlockSizeAES128;
        void *buffer = malloc(bufferSize);
        size_t numBytesDecrypted = 0;
        CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
                                              kCCOptionPKCS7Padding | kCCOptionECBMode,
                                              keyPtr, kCCBlockSizeAES128,
                                              NULL,
                                              [data bytes], dataLength,
                                              buffer, bufferSize,
                                              &numBytesDecrypted);
        if (cryptStatus == kCCSuccess) {
            return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
    
        }
        free(buffer);
        return nil;
    }
    
    
    //加密
    + (NSData *) AES256_Encrypt:(NSData *)data withKey:(NSData *)key {
        char keyPtr[kCCKeySizeAES256+1];
        bzero(keyPtr, sizeof(keyPtr));
        //[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
        [key getBytes:keyPtr length:kCCKeySizeAES128+1];
    
        NSUInteger dataLength = [data length];
        size_t bufferSize = dataLength + kCCBlockSizeAES128;
        void *buffer = malloc(bufferSize);
        size_t numBytesEncrypted = 0;
        CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
                                              kCCOptionPKCS7Padding | kCCOptionECBMode,
                                              keyPtr, kCCBlockSizeAES128,
                                              NULL,
                                              [data bytes], dataLength,
                                              buffer, bufferSize,
                                              &numBytesEncrypted);
        if (cryptStatus == kCCSuccess) {
            return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
        }
        free(buffer);
        return nil;
    }
    
    @end